- A40 min
- B20 min
- C10 min
- D60 min
Step-by-Step Solution
Pairwise gaps close at 2, 1.5 and 3.5 m/s, so pairs meet every s, s and s. The first common time is LCM(600, 800) = 2400 s, which is also . 2400 s = 40 min.
Answer: A) 40 min
Three runners start together on a 1.2 km circular track and run the same way at 2 m/s, 4 m/s and 5.5 m/s. After how long will all three first be together again anywhere on the track?
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